The paper describes the work being conducted in the Cross-institutional Authority Collaboration (Institutionenübergreifende Integration von Normdaten, IN2N) project. This pilot project, executed in cooperation with the German National Library and the German Film Institute, aims to establish new collaboration models to improve cross-domain authority maintenance. The paper outlines applied strategies for providing a shared infrastructure as well as workflows for exchanging data about persons; interface enhancements permitting the exploitation of innovative web approaches; and cross-institutional data search and representation solutions. Furthermore, we discuss specific boundary conditions, such as disparities in the level of data granularity, for an interoperable cataloguing environment.